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Media distribution through application-layer overlay networks has received considerable attention recently, owing to its flexibility and readily deployable nature. On-demand streaming with asynchronous requests, and in general, with VCR-like interactions, nevertheless remains a challenging task in overlay networks. In this paper, we introduce the Dynamic Skip List (DSL), a novel randomized and distributed structure that inherently accommodates dynamic and asynchronous clients. We establish the theoretical foundations of the DSL and demonstrate a practical DSL-based streaming overlay. In this overlay, the costs for typical operations, including join, leave, fast-forward, rewind, and random-seek are all sub-linear to the client population. The model also seamlessly integrates a smart data scheduling algorithm using linear network coding, yielding fast and robust downloading from multiple suppliers. Our simulation results show that the DSL-based overlay is highly scalable. It delivers reasonably smooth playback with diverse client interactivities, while keeping the computation and bandwidth overheads low.
Applications, Protocol architecture

D. Wang and J. Liu, "A Dynamic Skip List-Based Overlay for On-Demand Media Streaming with VCR Interactions," in IEEE Transactions on Parallel & Distributed Systems, vol. 19, no. , pp. 503-514, 2007.
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